/* ----------------------------------------------------------------------
* Copyright (C) 2010 ARM Limited. All rights reserved.
*
* $Date:        15. February 2012
* $Revision: 	V1.1.0
*
* Project: 	    CMSIS DSP Library
* Title:		arm_cmplx_mag_f32.c
*
* Description:	Floating-point complex magnitude.
*
* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
*
* Version 1.1.0 2012/02/15
*    Updated with more optimizations, bug fixes and minor API changes.
*
* Version 1.0.10 2011/7/15
*    Big Endian support added and Merged M0 and M3/M4 Source code.
*
* Version 1.0.3 2010/11/29
*    Re-organized the CMSIS folders and updated documentation.
*
* Version 1.0.2 2010/11/11
*    Documentation updated.
*
* Version 1.0.1 2010/10/05
*    Production release and review comments incorporated.
*
* Version 1.0.0 2010/09/20
*    Production release and review comments incorporated.
* ---------------------------------------------------------------------------- */

#include "arm_math.h"

/**
 * @ingroup groupCmplxMath
 */

/**
 * @defgroup cmplx_mag Complex Magnitude
 *
 * Computes the magnitude of the elements of a complex data vector.
 *
 * The <code>pSrc</code> points to the source data and
 * <code>pDst</code> points to the where the result should be written.
 * <code>numSamples</code> specifies the number of complex samples
 * in the input array and the data is stored in an interleaved fashion
 * (real, imag, real, imag, ...).
 * The input array has a total of <code>2*numSamples</code> values;
 * the output array has a total of <code>numSamples</code> values.
 * The underlying algorithm is used:
 *
 * <pre>
 * for(n=0; n<numSamples; n++) {
 *     pDst[n] = sqrt(pSrc[(2*n)+0]^2 + pSrc[(2*n)+1]^2);
 * }
 * </pre>
 *
 * There are separate functions for floating-point, Q15, and Q31 data types.
 */

/**
 * @addtogroup cmplx_mag
 * @{
 */
/**
 * @brief Floating-point complex magnitude.
 * @param[in]       *pSrc points to complex input buffer
 * @param[out]      *pDst points to real output buffer
 * @param[in]       numSamples number of complex samples in the input vector
 * @return none.
 *
 */


void arm_cmplx_mag_f32(
    float32_t* pSrc,
    float32_t* pDst,
    uint32_t numSamples)
{
	float32_t realIn, imagIn;                      /* Temporary variables to hold input values */

#ifndef ARM_MATH_CM0

	/* Run the below code for Cortex-M4 and Cortex-M3 */
	uint32_t blkCnt;                               /* loop counter */

	/*loop Unrolling */
	blkCnt = numSamples >> 2u;

	/* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
	 ** a second loop below computes the remaining 1 to 3 samples. */
	while(blkCnt > 0u) {

		/* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
		realIn = *pSrc++;
		imagIn = *pSrc++;
		/* store the result in the destination buffer. */
		arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);

		realIn = *pSrc++;
		imagIn = *pSrc++;
		arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);

		realIn = *pSrc++;
		imagIn = *pSrc++;
		arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);

		realIn = *pSrc++;
		imagIn = *pSrc++;
		arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);


		/* Decrement the loop counter */
		blkCnt--;
	}

	/* If the numSamples is not a multiple of 4, compute any remaining output samples here.
	 ** No loop unrolling is used. */
	blkCnt = numSamples % 0x4u;

	while(blkCnt > 0u) {
		/* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
		realIn = *pSrc++;
		imagIn = *pSrc++;
		/* store the result in the destination buffer. */
		arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);

		/* Decrement the loop counter */
		blkCnt--;
	}

#else

	/* Run the below code for Cortex-M0 */

	while(numSamples > 0u) {
		/* out = sqrt((real * real) + (imag * imag)) */
		realIn = *pSrc++;
		imagIn = *pSrc++;
		/* store the result in the destination buffer. */
		arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);

		/* Decrement the loop counter */
		numSamples--;
	}

#endif /* #ifndef ARM_MATH_CM0 */

}

/**
 * @} end of cmplx_mag group
 */
